ngtwolf
Veteran Member
Hi All,
Question, but first a bit of a backstory. Picked up a Commodore Pet 4032 a few years back that was modded to be an 8032. It had some ram issues and I fixed those, but I left it as an 80 column. Recently I picked up the following board and figured i'd put that in so I'd have both options ( http://www.6502.org/users/sjgray/projects/multied4080/index.html ). To play it safe, I cleaned up all the old wirewrap that was on there, put some modern pin headers (or pin sockets) in the appropriate place, and reverted it back to 40 column. There was some challenges in that since it turns out there was an issue with one of the video ram LS chips, and there was some terrible butcher soldering that was done in the past I had to clean up.. but eventually got it all working in 40 column. The interesting thing is that it doesn't work in 40 column at all with UB8 socketed (even with pin 1 disconnected) which seemed odd since this blog ( http://blog.tynemouthsoftware.co.uk/search?q=40+80+column ) about reverting seem to imply that he originally left UB8 socketed and didn't have an issue, but he did pull out the ram so who knows).
Now fast forward to my problem. I can easily swap between 40 and 80 columns by changing the jumpers and the roms (and adding UB8 for 80 column) but whenever I hook up the board i just get garbage whether having it at 40 columns or 80 columns using standard 40 column and 80 column CRTC N keyboard roms. I'm 1) curious if anyone has even used this board - maybe there's something wrong with it (there were some typos in the instructions that I caught) and if anyone has, maybe they have some suggestions to look for. Incidentally i'm using the MER-SET-03-N-Keyboard bin on here (https://github.com/sjgray/Multi-EditROM-Builder/tree/master/ROM_Sets), if that matters.
Thanks for any help!
Question, but first a bit of a backstory. Picked up a Commodore Pet 4032 a few years back that was modded to be an 8032. It had some ram issues and I fixed those, but I left it as an 80 column. Recently I picked up the following board and figured i'd put that in so I'd have both options ( http://www.6502.org/users/sjgray/projects/multied4080/index.html ). To play it safe, I cleaned up all the old wirewrap that was on there, put some modern pin headers (or pin sockets) in the appropriate place, and reverted it back to 40 column. There was some challenges in that since it turns out there was an issue with one of the video ram LS chips, and there was some terrible butcher soldering that was done in the past I had to clean up.. but eventually got it all working in 40 column. The interesting thing is that it doesn't work in 40 column at all with UB8 socketed (even with pin 1 disconnected) which seemed odd since this blog ( http://blog.tynemouthsoftware.co.uk/search?q=40+80+column ) about reverting seem to imply that he originally left UB8 socketed and didn't have an issue, but he did pull out the ram so who knows).
Now fast forward to my problem. I can easily swap between 40 and 80 columns by changing the jumpers and the roms (and adding UB8 for 80 column) but whenever I hook up the board i just get garbage whether having it at 40 columns or 80 columns using standard 40 column and 80 column CRTC N keyboard roms. I'm 1) curious if anyone has even used this board - maybe there's something wrong with it (there were some typos in the instructions that I caught) and if anyone has, maybe they have some suggestions to look for. Incidentally i'm using the MER-SET-03-N-Keyboard bin on here (https://github.com/sjgray/Multi-EditROM-Builder/tree/master/ROM_Sets), if that matters.
Thanks for any help!